Rewrite DownloadsApiTest in C++.

This uses much less magic than the javascript version, so it's more robust and easier to debug and fix.

Aaron is the primary reviewer since most of this is extensions-specific.
Randy, none of this is particularly downloads-specific. You're welcome to review or mute.

ExtensionDownloadsEventRouter sends a chrome::NOTIFICATION_EXTENSION_DOWNLOADS_EVENT notification whenever it fires an event.
DownloadsEventsListener is-a content::NotificationObserver that listens for chrome::NOTIFICATION_EXTENSION_DOWNLOADS_EVENT and logs them. DEL facilitates waiting for specific events by running the message loops.
BrowserContext::GetFileSystemContext() is used to create HTML5 FileSystem Files.
Empty extensions are used because DownloadsDownloadFunction relies on its host permissions mechanisms.

I considered grouping all of the new TEST_Fs in a single large TEST_F in order to amortize start-up cost, but that would have required a comment explaining how to disable sub-sections, and it would have complicated time-outs. Besides, most bots can parallelize.

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=144807
Reverted due to word length mismatch bug in downloads_api_unittest.cc:1581: https://chromiumcodereview.appspot.com/10700024/
Trying again with %d and static_cast<int>().

Review URL: https://chromiumcodereview.appspot.com/10542038

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@144921 0039d316-1c4b-4281-b951-d872f2087c98

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